Abstract
The translation factor 5A (eIF5A) is highly conserved in Archaea and eukaryotes and is essential for cell viability. This is the only protein known to contain the amino acid residue hypusine, essential for eIF5A function, generated by a post-translational modification. The functional homolog of eIF5A in bacteria is the EF- P factor, which also undergoes a modification of lysyl or arginyl-…